Asbestus sheet



(.mmdel') R. H. MARTIN.

AsBBsTUs SHEET. No. 354,158. Patented Deo. 14, 1886.

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UNITED STATES PATENT OFFICE.

ROBERT H. MARTIN, OF BROOKLYN, NEYV YORK.

ASBESTUS SHEET.

SPECIFICATION forming part of Letters Patent No. 354,158, dated December 14, 1886.

Application iled September 15, 1886. Serial 170.5213640. (No model.) i

To a/ZZ whom, it may concern.-

Be it known that I, ROBERT H. MARTIN, a citizen of the United States, residing at Brooklyn, in the county of Kings and Stateof New York, have invented certain new 'and useful Improvements in Asbestus Sheets, and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Figure l is a perspective of my nonconducting sheet made of superimposed slivers of ber. Fig. 2 is a cross-section of the same rolled into a pipe-covering. Fig. 3 is a crosssection of my covering when the superimposed-slivers are coiled. Fig. 4 is the same as Fig. 3 with the'coil cut on one side.

My invention relates to removable noncomducting and inconibustible sheets to prevent the radiation and conduction of heat, and for other purposes.

The sheet is or may be flat or cylindrical, and is made of slfperiinposed slivers of asbestus tiber, so constructed as to be applied to any surfaces needed to be covered.

In making this sheet I run from a card or apron a thin sliver of asbestus liber and deposit it in even layers on a moving apron or table, or coil it upon a revolving cylinder or mandrel, as shown in Fig. 3, until a sufficient thickness of sheet is obtained and of any size desired. The fiber is at some convenient stage between its condition as raw ber and the deposition ofthe sliver upon the apron or mandrels, or duringsuch deposition or mandrel, treated with water or sizing material, preferably of a non-combustible character-such as silicate of soda-and also preferably in a wet state. No felting operation is employed, but a pressure regulated by the density required is applied to the bat or sheet being made. rThis I obtain by a pressure-roller adj ustably arranged over the apron or table or against the mandrel. The fiber I use is asbestus in a liocky state, with which, however, may be admixed fibers of hair, wool, mineral wool, Src., as also mineral, clayey, chalky, or infus'orial earths in a finely-divided state.

This bat or sheet when dried is a flexible, elastic, and non-combustible covering, resembling felt, of excellent non-conducting character, capable of easy application or removal. It may easily be made water-proof by the appli cation of--either of several well-known processes. f

The flat sheet A can be applied to Hat or slightly-curved or irregular surfaces, or rolled into cylindrical shape, as shown in Fig. 2, and the coiled sheet or cylinder, which may be cut, as shown at B, on one side longitudinally, can be applied to pipes, (shown in Fig. 3,) or opened out to make a tiat or curved sheet. The outer slivers of the sheet, Hat or coiled, may be so saturated with size as to constitute a hard and strong exterior.

The sheet may be re-enforced on either side by layers of paper (combustible or incombustible) o r other material fastened or pasted to it, and maybe so applied on the outside as to leave flaps c c to cover joints in and between sections or sheets, over the vlongitudinal cuts in the cylindrical sheets; or the sections may be secured byties, tacks, staples, or other conr mon devices, and the joints may be covered with pasted strips.

These sheets when used as coverings may also be used in connection with other covering placed inside or outside of it, and may when applied be covered or wrapped with paper or canvas or painted to finish.

It must be understood that the fiber is not pulped, as in the manufacture ofpaper and mill board, so that it remains intact in its length, andthe sheet is not dependent merely on compressure for its strength, as in the case of paper, the fiber not being broken or pulped, as in the latter case. I prefer to use a eardingengine in disintegrating and laying the fibers, as the fiber is opened out more thoroughly and deposited more evenly.

This sheet is adapted for use as packing for ljoints, re-prooflining for carpets, and, in fact,

for any purpose where 1ireproof, insulating, or water-proof qualities are desired.

Vhat I claim to be new, and desire to secure by Letters Patent, is-

y A non-conducting sheet composed of thin slivers of asbestus superimposed or coiled upon each other, constructed substantially as described. A

In testimony whereof Iaftix my signature in presence of two witnesses.

ROBERT H. MARTIN.

Witnesses:

JAMES DEMAREsT, E. A. HoLToN.

IOO 

